If I could have a super-power what would I choose asks John Scalzi. A woman I know says she has Parking Lot Prescience. When she pulls into a parking lot, she wills someone else to pull out and leave her a space right next to the Mall entrance. I have been with her, and it works.
If I could have the super=power of an existing super hero would be the Shadow, who "clouds men's minds with a single hypnotic gesture". Makes himself invisible, or look like beast, or charming to the ladies.